105 



EXPLANATION OF PLATE XXXA'L 



L The Horse-chesnut Tribe. — L A panicle of flowers of the 

 Pink Horse-chesnut (iEsculus rosea). — 2. The stamens and disk 

 (a) of one of the flowers — 3. The ovary, with the one-sided disk 

 (a) at its base. — 4. A longitudinal section of the ovary, shewing the 

 ovules in their two different positions. — 5. A stamen. — 6. A seed- 

 vessel, natural size. — 7. A seed; a the scar or hilura ; h the conical 

 projection on one side of the scar, indicating the position of the 

 radicle. 



II. The Walnut Tribe. — 1. A portion of a twig of the Com- 

 mon Walnut (Juglans regia), with a stamen-bearing catkin. — 2. 

 One of the stamen -bearmg flowers, in the position in which it hangs 

 in the catkin. — 3. A stamen. — 4. Two pistil-bearing flowers ; a the 

 calyx, b the petals. — 5. A longitudinal section of one of these flowers; 

 a the o\Tile, b the calyx, c one of the petals. — 6. A ripe seed, 

 with a portion of its side cut out to shew the radicle at a. — 7. A 

 ripe fruit. — 8. A nut ; a the apex ; b the base. 



